#pragma once
#include <iostream>
#include <string>
#include <functional>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "Log.hpp"
#include "InetAddr.hpp"

// 日志模块
using namespace LogModule;

using func_t = std::function<std::string(const std::string&, InetAddr&)>;

const int defaultfd = -1;

class UdpServer
{
public:
    // UdpServer( const std::string& ip,uint16_t& port)
    UdpServer(uint16_t &port,func_t func)
        : _sockfd(defaultfd),
          _port(port),
          // _ip(ip),
          _isrunning(false),
          _func(func)

    {
    }
    void Init()
    {
        // 1. 创建socket套接字
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket error!";
            exit(1);
        }

        LOG(LogLevel::INFO) << "socket success, sockfd : " << _sockfd;

        // 2. 绑定socket信息（ip和端口号）
        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;

        // 本地系列转化成网络系列
        local.sin_port = htons(_port);
        // local.sin_addr.s_addr = inet_addr(_ip.c_str());
        local.sin_addr.s_addr = INADDR_ANY;

        int n = bind(_sockfd, (const sockaddr *)&local, sizeof(local));
        if (n < 0)
        {
            LOG(LogLevel::FATAL) << "bind error!";
            exit(2);
        }

        LOG(LogLevel::INFO) << "bind success,sockfd : " << _sockfd;
    }
    void Start()
    {
        _isrunning = true;
        while (_isrunning)
        {
            char buffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            // 1. 收消息
            ssize_t s = recvfrom(_sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr *)&peer, &len);//struct sockaddr通过派生类间接包含IP和端口号
            if (s > 0)
            {
                InetAddr client(peer);
                buffer[s] = 0;

                std::string result = _func(buffer,client);

                //LOG(LogLevel::DEBUG) << "[" << peer_ip << ":" << peer_port << "]#" << buffer;

                // 2. 发送消息，即响应
                // std::string echo_string = "server echo@ ";
                // echo_string += buffer;
                sendto(_sockfd, result.c_str(), result.size(), 0, (struct sockaddr *)&peer, len);
            }
        }
    }
    ~UdpServer()
    {
    }

private:
    int _sockfd;
    uint16_t _port; // 端口号
    //std::string _ip; // 点分十进制的ip地址
    bool _isrunning;

    func_t _func;//服务器回调函数，目的为了对数据进行处理
};

